You may remember that sex tape, which was filmed in 2003 and released in 2007, for being definitive proof that Ray J once had sex with Kim Kardashian. In case you had forgotten that Ray J and Kim Kardashian have had sex, Ray J is releasing a new single to iTunes next week titled "I Hit it First." It's a not-so-sly shot at Kanye West, who is expecting a baby girl with Kardashian later this year. Ray J really wants you to remember that he once had sex with Kim Kardashian, even before Kanye West. Applaud this man! Of course, the sad irony for Ray J is that the sex tape only launched one career. Kardashian has gone on to build a powerhouse brand Kim sex movie last year Forbes ranked her at No. 7 on their "Celebrity 100" list. She earned an estimated $18 million in 2012 off of her various reality shows, endorsements and own retail products. Ray J, meanwhile, did not land anywhere on Forbes' "Celebrity 100" list. <br>More: http://www.spin.com/articles/ray-j-i-hit-it-first-stream-kanye-west-kim-kardashian/